First Audio Unit - odd rezzy Lowpass filter
First Audio Unit - odd rezzy Lowpass filter
- Subject: First Audio Unit - odd rezzy Lowpass filter
- From: Oli Donald <email@hidden>
- Date: Wed, 15 Jan 2003 23:32:46 +0000
Hi,
I have just finished writing my first audio-unit plugin, based on a
C-Sound patch I wrote many moons ago. Much thanks to Andrew Ostler,
who's PingPong Delay source was used as a guide.
It is available here:
http://www.widosm.com/WidoLowPass.sit
Its a low-pass filter, but one that was made before I knew about
biquads and z-transforms and all that, so its an odd approach, but with
default settings sounds like a nice, warm lowpass filter. It has
settings for cut-off and also resonance, which can go *beyond*
self-oscillation, so be careful!
It has two other parameters, the diff slew-rate and integ slew-rate (im
not sure what to call them). Setting the first to about 0.35 with the
other up around 0.8, with the filter on the edge of or slightly past
self-oscillation produces some very strange effects.
I hope some of you try it out and enjoy it...im going to optimise it a
bit and release the hp/bp/br brethren soon.
Cheers,
Oli
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